Graphene

The Catalan Institute of Nanoscience and Nanotechnology has created a modern graphene sensor used in the treatment of epilepsy and Parkinson’s disease.

An excerpt from the article 19 facts about graphene

It records brain activity at frequencies below 0.1 Hz. Tests of brain activity in such ranges provide a high possibility of predicting the probability of an epileptic seizure and stroke. This device is biocompatible, so it guarantees proper functioning in the body. The graphene sensor can also switch to stimulation mode during operation, which is used during speech rehabilitation.